Papermark: Know Who Actually Read Your Deck
You email someone a proposal as an attachment, and then... nothing. Did they open it? Did they read past page two? Did they forward it to a competitor? Email attachments are a black hole with a paperclip icon.
Papermark replaces the attachment with a trackable link - and unlike the incumbent it's usually compared to (DocSend), its core is open source and you can start for free.
From attachment to trackable link
Upload a document, get a link, share the link. Then comes the useful part: page-by-page analytics per viewer - who opened it, how long they spent on each page, and when they came back for a second look. A proposal that gets three re-reads of the pricing page is a different conversation than one that never got opened.
When discretion matters, you can add a password, require a one-click NDA before anything loads, or stamp every view with a dynamic watermark carrying the viewer's email, IP and timestamp. Custom domains and white-label branding keep the whole thing looking like you, not like a service.
Data rooms for the serious stuff
For fundraising, M&A and due diligence, Papermark sells full virtual data rooms: unlimited permissioned rooms with granular folder and file access, a Q&A module, file requests, AI redaction and an append-only audit log. Data rooms start at €99 per month on annual billing, with a 7-day trial that doesn't ask for a card. Papermark advertises SOC 2 Type II and ISO 27001 certification, GDPR and CCPA compliance, and EU hosting by default (Frankfurt; US hosting is an option) - the pitch being that legacy data-room providers charge quote-based, per-page prices for less.
Open source, self-hostable, agent-friendly
The core is AGPLv3, with over nine thousand GitHub stars and an active repo, and that core is what you can self-host with your own storage bucket. Mind the boundary: data rooms, Q&A conversations and advanced permissions live in the enterprise directories under a commercial license, so self-hosting doesn't make the paid features free - running those on your own servers still requires an Enterprise subscription.
And unusually for this category, everything is scriptable: a public REST API, an npm CLI, and an MCP server with 57 tools, so an AI agent can create and run a data room for you. It might be the only virtual data room that expects robots as customers.
The catch
The free plan is real but narrow: document sharing only, 50 documents, one team member, no data rooms. The features that make Papermark feel grown-up - watermarking, NDA gating, the data rooms themselves - live in the paid tiers: document plans from €24 per month, data rooms from €99, on annual rates. Self-hosting means running and maintaining a real web application. And no screenshot protection beats a phone camera pointed at a monitor; treat it as a deterrent with an audit trail, not a force field.
Verdict
If you send decks, proposals or confidential PDFs and wonder what happens after you press send, Papermark's free tier answers the question in an afternoon. If you're raising money, it's one of the few open-source data rooms serious enough to put in front of investors. Start free, upgrade when a deal needs it, self-host if you're paranoid - in the good way.
